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Mercedes-Benz SL550 vs Porsche 911

Side-by-side comparison from manufacturer specifications, NHTSA safety data, and live dealer listings.

Vehicles

Mercedes-Benz logo

2020 Mercedes-Benz SL550

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Porsche logo

2027 Porsche 911

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Overview

SpecMercedes-Benz SL550SL 550Porsche 911Carrera
Selected trimSL 550Carrera
Body styleConvertibleCoupe
Drivetrainrear wheel driverear wheel drive
Fuel typepremium unleaded (required)premium unleaded (required)
Transmission9-speed shiftable automatic8-speed automatic
Engine typegasgas
Model year20202027

Pricing & market

SpecMercedes-Benz SL550SL 550Porsche 911Carrera
MSRP$114,700 (best)$135,500
Lowest listing price—$113,998 (best)
Median listing price—$204,825 (best)
Highest listing price—$469,998 (best)
For sale now06 (best)

Fuel economy & range

SpecMercedes-Benz SL550SL 550Porsche 911Carrera
Combined MPG20 MPG21 MPG (best)
City MPG17 MPG18 MPG (best)
Highway MPG25 MPG25 MPG
Fuel tank19.8 gal (best)17 gal

Performance

SpecMercedes-Benz SL550SL 550Porsche 911Carrera
Horsepower449 hp (best)388 hp
Torque516 lb-ft (best)331 lb-ft
Engine size4.7 L (best)3 L
CylindersV8flat 6

Size & capability

SpecMercedes-Benz SL550SL 550Porsche 911Carrera
Seating2 seats4 seats (best)
Doors22
Cargo volume13.5 cu ft (best)—
Curb weight4,012 lbs3,342 lbs (best)
Ground clearance3.7 in (best)—
Wheelbase101.8 in (best)97 in
Length182.3 in (best)179 in
Width73.9 in (best)73 in
Height51.2 in (best)51 in

Safety & recalls

SpecMercedes-Benz SL550SL 550Porsche 911Carrera
Open recalls (YMM scope)None reportedNone reported

Highlighted values indicate the better figure for that spec when a clear winner exists. Specs reflect the selected trim for each vehicle. Drag a vehicle header to reorder columns. MSRP and specifications are manufacturer data; listing prices and inventory come from live dealer listings. Safety ratings are from NHTSA.

Trim overview

All available trims with MSRP. The trim selected above is highlighted; comparison specs use that selection.

TrimMercedes-Benz SL550Porsche 911
1

SL 550

$114,700 MSRP(Currently comparing)

Carrera

$135,500 MSRP(Currently comparing)

2—

Carrera

$149,400 MSRP

3—

Carrera T

$148,000 MSRP

4—

Carrera T

$161,900 MSRP

5—

Carrera S

$156,200 MSRP

6—

Carrera S

$170,100 MSRP

7—

Carrera 4S

$164,500 MSRP

8—

Carrera 4S

$178,400 MSRP

9—

4S

$180,200 MSRP

10—

Carrera GTS

$181,000 MSRP

11—

Carrera GTS

$194,900 MSRP

12—

Carrera 4 GTS

$189,300 MSRP

13—

Carrera 4 GTS

$203,300 MSRP

14—

911 4 GTS

$203,300 MSRP

15—

GT3

$235,800 MSRP

16—

GT3

$235,800 MSRP

17—

GT3

$273,000 MSRP

18—

Turbo S

$270,300 MSRP

19—

Turbo S

$284,300 MSRP

Live inventory

Mercedes-Benz SL550 vs Porsche 911 FAQ

Which is better: 2020 Mercedes-Benz SL550 or 2027 Porsche 911?
It depends on priorities. OpenDealer compares 2020 Mercedes-Benz SL550 vs 2027 Porsche 911 on MSRP, fuel economy, horsepower, seating, towing, NHTSA safety ratings, and live market prices so you can weigh the tradeoffs.
Which costs less: 2020 Mercedes-Benz SL550 or 2027 Porsche 911?
Based on starting MSRP, the 2020 Mercedes-Benz SL550 starts lower at $114,700. Live Porsche 911 listings start at $113,998.
Which has better startingMsrp: 2020 Mercedes-Benz SL550 or 2027 Porsche 911?
The 2020 Mercedes-Benz SL550 leads on startingMsrp in this comparison (114,700).
Which has better combinedMpg: 2020 Mercedes-Benz SL550 or 2027 Porsche 911?
The 2027 Porsche 911 leads on combinedMpg in this comparison (21).
Which has better horsepower: 2020 Mercedes-Benz SL550 or 2027 Porsche 911?
The 2027 Porsche 911 leads on horsepower in this comparison (701).
Which has better seats: 2020 Mercedes-Benz SL550 or 2027 Porsche 911?
The 2027 Porsche 911 leads on seats in this comparison (4).